"Maybe in some remote island, where there are no civilization." That should be "is", not "are". Civilization is singular.

CHILDISH, SCREAMING LEGENDARIES! GAH! In the back of my head, I keep thinking: Jirachi and Celebi are centuries old, at least. Mew is MILLENIA old. Mewtwo is only a few decades old; he was created by humans. Yet it seems that Mewtwo and Suicune are the most mature ACTING of this lot. And the ironic thing is that Suicune was REBORN a while ago, and, even then, didn't play a role in the creation of the universe. MEW, YOU'RE THE OLDEST POKEMON HERE, DANGIT! ACT YOUR AGE!